Custom Power Bank |1| Analysis (Commercial)

Intro

This series of notes describes developing process of custom power bank.

Purpose: list of commercial DIY power bank for analysis of their design (case, size, main power chip, connectors, battery, etc.).

Name	Photo	Specs	Price, USD	Note
3*18650 Battery Charger Case DIY Power Bank Box Fast Charge 5V 2A Double USB Output Battery Storage Box With LED Night Light		3x 18650 USB-A: 5V 2A USB-C: MicroUSB: Display LED light	3.12	Not support batteries with protection (due to size) Need to solder cells (no holder)
21700 Power Bank Cases Battery Storage Box Night Light USB Charge DIY Shell 21700 Battery Storage Box for iPhone Xiaomi		22.5W	5.11
Battery Storage Box 8 x 21700 DIY Power Bank Case Digital Display Dual USB Fast Charger Type C Interface Battery Holder Case		Output power: 22.5W USB output: 5V/3A, 9V/2A, 12V/1.5A (only 5V for simultaneous output of multiple ports) IN input: 5V/2A Type-C output: 5V/3A, 9V/2A, 12V/1.5A (support PD protocol only output) Type-C input: 5V/3A, 9V/2A, 12V/1.5A	8.56
Transparent Shell 6*18650 Power Bank Case 22.5W Fast Charging LED Type C + Dual USB Port Battery Storage Box For iPhone Samsung		6x18650 Output power: 22.5W OUT1 output: 5V/3.1A, 9V/2.5A, 12V/1.87A (support 5V side charging and discharging) OUT2 output: 5V/4.5A (VOOC), 9V/2.5A, 12V/1.87A (multiple simultaneous outputs only 5V) IN input (micro): 5V/3A, 9V/2A, 12V/1.5A Type-C output: 5V/3.7A, 9V/2.22A, 12V/1.67A (support PD protocol only output) Type-C input: 5V/3A, 9V/2A, 12V/1.5A	6.84
Suitable for digital charging treasure parts high power full protocol 21700 45W mini mobile power nesting kit HD		IP5386 USB-A MicroUSB USB-C Lighting	32.79	Video: https://www.youtube.com/watch?v=Zo_tuVBQd7w